These are the Bontrager 2013 Rhythm Plus Double Lock-On Grips. Plus-sized for riders who prefer a larger diameter, more cushioned grip. Confidence-inspiring dual-clamp lock-on design provides ultimate security for riders who push their equipment to the limit. Lock-on design makes grips easy to install and replace. Hard inner core prevents wind-up and eliminates slipping. Soft outer layer provides great hand traction. Aggressive texture helps keep hands from slipping.